81152928 has 120 divisors (see below), whose sum is σ = 241496640. Its totient is φ = 26732160.

The previous prime is 81152927. The next prime is 81152963. The reversal of 81152928 is 82925118.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 81152892 and 81152901.

It is not an unprimeable number, because it can be changed into a prime (81152927) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 339433 + ... + 339671.

It is an arithmetic number, because the mean of its divisors is an integer number (2012472).

Almost surely, 2^81152928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81152928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120748320).

81152928 is an abundant number, since it is smaller than the sum of its proper divisors (160343712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81152928 is a wasteful number, since it uses less digits than its factorization.

81152928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 375 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 81152928 is about 9008.4919936691. The cubic root of 81152928 is about 432.9469966252.

The spelling of 81152928 in words is "eighty-one million, one hundred fifty-two thousand, nine hundred twenty-eight".